package com.leyou.item.service.impl;

import com.baomidou.mybatisplus.extension.conditions.query.QueryChainWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.leyou.common.exception.LyException;
import com.leyou.item.dto.SpecGroupDTO;
import com.leyou.item.dto.SpecParamDTO;
import com.leyou.item.entity.SpecGroup;
import com.leyou.item.entity.SpecParam;
import com.leyou.item.mapper.SpecGroupMapper;
import com.leyou.item.service.SpecGroupService;
import com.leyou.item.service.SpecParamService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service
public class SpecGroupServiceImpl extends ServiceImpl<SpecGroupMapper, SpecGroup> implements SpecGroupService {
    @Autowired
    private SpecParamService specParamService;

    @Override
    public List<SpecGroupDTO> getSpecGroupDTOByid(Long id) {
        //查询规格组
        List<SpecGroup> groupDTOS = query().eq("category_id", id).list();
        //转换成SpecGroupDTO
        List<SpecGroupDTO> groupList = SpecGroupDTO.convertEntityList(groupDTOS);
        //判断是否为空
        if (CollectionUtils.isEmpty(groupList)) {
            throw new LyException(404, "该分类下的规格组不存在！");
        }
        //查询规格参数组
        List<SpecParamDTO> paramList = specParamService.querySpecParams(id, null, null);

        // 对规格参数分组，groupId一致的在一组
        Map<Long, List<SpecParamDTO>> map = paramList.stream().collect(Collectors.groupingBy(SpecParamDTO::getGroupId));
        // 把参数放入group
        for (SpecGroupDTO groupDTO : groupList) {
            groupDTO.setParams(map.get(groupDTO.getId()));
        }
        return groupList;
    }

    @Override
    public List<SpecGroupDTO> querySpecList(Long cid) {
        List<SpecGroupDTO> specGroupDTOS = getSpecGroupDTOByid(cid);

        List<SpecParamDTO> specParamDTOS = SpecParamDTO
                .convertEntityList(
                        this.specParamService
                                .query()
                                .eq("category_id", cid)
                                .list());

        //对specParamDTO的集合进行分组，按照groupId处理，map的key就是groupId，value此id对应的规格参数集合
        Map<Long, List<SpecParamDTO>> paramMap = specParamDTOS
                .stream()
                .collect(Collectors.groupingBy(SpecParamDTO::getGroupId));

        //循环给每个group赋值对应的param信息
        specGroupDTOS.forEach(specGroupDTO -> specGroupDTO.setParams(paramMap.get(specGroupDTO.getId())));


        return specGroupDTOS;
    }
}